Putin substantially weakened his counter-sanction in April; from then it no longer applied to "friendly countries" even if they participated in a capped import together with e.g. a transporter or insurer from the "unfriendly countries" that established the cap scheme. (A reminder how the cap works, roughly: it prohibits G7+EU companies from insuring or transporting Russian oil by sea, unless the price of that shipment is capped.)
The Russian counter-sanction was meaningless on most of the imposing (G7+EU) countries to begin with since most of them had already banned imports of Russian oil (by sea) to their own territories. The only exception among these is/was Bulgaria, which received a dispensation from the EU ban to keep importing Russian oil by sea until the end of 2024. (Croatia also got one, but only for VGO, until the end of 2023.)
So, Bulgaria and Croatia (which are on the "unfriendly countries" list) are the only countries to which Putin's counter-sanction could meaningfully apply to, after April. But I've not heard of Bulgaria being denied Russian oil sales until now, or Croatia being denied VGO.
The other two more major importers of Russian oil (than Bulgaria) are India and China, this year. (India used to import next to no Russian oil before the war, by the way.) And I guess Russia wasn't willing to go through and sanction these two with an oil ban, even though they seemed happy to apply the price cap, if US Treasury data is to be believed.
In a slightly weird setup, Bulgaria also exported large amounts of refined petroleum products [mostly red diesel] to Ukraine in 2022, 1,000-fold the amount they did in 2021. But their largest refinery is owned by Lukoil, a Russian company.
Hurting Croatia might seem something the Kremlin's would have fewer qualms about, especially since them not securing an exemption for Russian oil (instead of just VGO) hurt Serbia (which is rather pro-Russian, and imported oil through Croatia). But I've not heard of Russian VGO sales to Croatia being stopped either. Granted, VGO is a somewhat obscure product, so it might not make the English-language news even if Russia does/did end those sales to Croatia.